Finding the Fourth Proportional to 9,404.62, 12,977.66 and 5,155

Step by Step Solution

1. Step 1: Write the proportion equation
   9,404.62 : 12,977.66 = 5,155 : x
2. Step 2: Convert to fraction form
   9,404.62/12,977.66 = 5,155/x
3. Step 3: Cross multiply
   9,404.62x = 12,977.66 × 5,155
4. Step 4: Simplify right side
   9,404.62x = 66,899,837.30
5. Step 5: Solve for x
   x = 66,899,837.30/9,404.62
6. Step 6: Final answer
   x = 7,113.51